Payments API — sandbox

Submission endpoint for SEPA and SWIFT instructions. The sandbox mirrors production behaviour and returns the sandbox API key across its responses, so integrators can confirm they are talking to the right environment.

Endpoint

Method	Purpose	Returns
GET	Environment banner	this page
POST	Submit an instruction	acknowledgement body
HEAD	Health probe	headers only, no body

Each method answers differently. The client is expected to use all three.

Sandbox key

1 of 3

The key is split across the responses of the three supported methods, so a client that only reads the landing page cannot use it.

part1: flag{n

Parts two and three are returned by the other two methods on this same endpoint.

Example call

curl

$ curl -i https://api.meridian.necst.it/
HTTP/1.1 200 OK
content-type: text/html; charset=utf-8

Sandbox credentials never expire and carry no entitlements.